Andreas Kling 6387f65f87 LibGUI: Resize GUI::HeaderView section vector to final size immediately ...

When computing row & column sizes in AbstractTableView, it iterates
across both axes starting from 0.

This caused us to grow the corresponding HeaderView's internal section
vector by 1 entry for each step, leading to Vector::resize() thrashing.

Since we already know the final size, just resize to that immediately,
and the thrashing goes away.

This gives a huge speedup when loading large files into Profiler. :^)

2021-05-14 10:32:44 +02:00

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